Delphi与DirectX之DelphiX（93）: TDIB.DrawDarken（）;

Delphi与DirectX之DelphiX（93）: TDIB.DrawDarken（）;2010-11-08 博客园万一本例效果图:

代码文件:

unit Unit1;
interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DIB, StdCtrls;
type
  TForm1 = class（TForm）
   DXPaintBox1: TDXPaintBox;
   Button1: TButton;
   Button2: TButton;
   Button3: TButton;
   ColorDialog1: TColorDialog;
   procedure FormCreate（Sender: TObject）;
   procedure FormDestroy（Sender: TObject）;
   procedure Button1Click（Sender: TObject）;
   procedure Button2Click（Sender: TObject）;
   procedure Button3Click（Sender: TObject）;
  end;
var
  Form1: TForm1;
implementation
{$R *.dfm}
var
  dib: TDIB;
procedure TForm1.Button1Click（Sender: TObject）;
begin
  DXPaintBox1.DIB.Assign（dib）;
  DXPaintBox1.Repaint;
end;
procedure TForm1.Button2Click（Sender: TObject）;
begin
  DXPaintBox1.DIB.DrawDarken（DXPaintBox1.DIB, 0, 0, dib.Width, dib.Height, 0）;
  DXPaintBox1.Repaint;
end;
procedure TForm1.Button3Click（Sender: TObject）;
begin
  if not ColorDialog1.Execute then Exit;
  DXPaintBox1.DIB.Fill（ColorDialog1.Color）;
  DXPaintBox1.DIB.DrawDarken（dib, 0, 0, dib.Width, dib.Height, 0）;
  DXPaintBox1.Repaint;
end;
procedure TForm1.FormCreate（Sender: TObject）;
const
  ImgPath1 = "C:Temp	est.bmp";
begin
  Position := poScreenCenter;
  dib := TDIB.Create;
  dib.LoadFromFile（ImgPath1）;
  DXPaintBox1.Width := dib.Width;
  DXPaintBox1.Height := dib.Height;
  Button1.Click;
end;
procedure TForm1.FormDestroy（Sender: TObject）;
begin
  dib.Free;
end;
end.